In the comment above, @thinkingtoilet apparently wants someone to kill them if they ever have severe dementia. Presumably that desire would be expressed in some sort of "living will" type document. If the patient meets the criteria then should a healthcare provider strap them down and kill them, even if in the moment the patient says then don't want to die? That seems ethically dubious. It essentially puts providers in the position of being serial killers.
Canada has also had some serious abuses and ethically questionable situations. They are not necessarily a model to emulate.
https://www.pbs.org/newshour/world/some-health-care-workers-...
Consider, for example, nuclear power. It has basically been regulated out of existence in the US because of the standard that radiation exposure must be as low as reasonably achievable. The problem with this is that it doesn't result in safer nuclear plants, it results in plants that run on different power sources. Natural gas? Approximately 10x the risk (and that's not counting climate effects.) Oil? Approximately 10x the risk of gas, thus 100x the risk of nuclear. Coal? Approximately 10x the risk of oil, thus 1000x the risk of nuclear. The expected (and observed) safety benefit of the regulations is negative.
And to preempt the inevitable "Fukushima!", that was political. The expected death toll of staying put was approximately zero. The city was evacuated, killing hundreds, for no good reason.
If quality of life can be negative then there will be cases where the humane act is to provide someone with a comfortable death.
And my point about nuclear power is that excessive regulation actually is counterproductive at maximizing human benefit.
And we are better off as individuals if we have the option of having external providers do it as that removes any dependency on actually being able to do things. There also is the benefit that it brings an external evaluation into the system that can recognize that maybe the evaluation was wrong. (I'm thinking of a case I heard about--woman thought she had lung cancer, chose to not treat it, simply work until she dropped. Autopsy said TB, not cancer.)